rishi: I think 9..f5 is not very pleasing for black as there is a lot of pressure down the a2-g8 diagonal and the pawn on e6 is definitely weak. I must admit that i do not know what other move could be better for black at move 9. NimzoIndian is normally bad for black when he lets white have the bishop pair AND fails to create any pawn weakness (islands). here white seems to have a massive centre and not much behind in development (another thing that black aims to create). FYI, The book by tony kosten is great for nimzo players!

patzer2: Here is an analysis using the ChessGames.com Opening Explorer and Fritz 8:

<1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 O-O!?> While I still much prefer the more popular 6...c5 here, I have changed my mind somewhat about my previously
posted comment, as I now realize there is nothing inherently wrong with 6...0-0!? After all, Tal , Fischer and Ivanchuk all previously
attempted it. <7. cxd5 Nxd5?!> This rare but dubious try, on the other hand, is a little hard to justify. Black lost all three games in the ChessGames.com database in which this move was attempted,
including Yurtaev vs R Dautov, 1989 and Shirov vs Ivanchuk, 1989 .
Relatively better for Black is the standard opening book continuation 7...
exd5 8. e3 Re8=, as in Chabanon vs S Romieux, 2001 . However, the results of Gheorghiu vs Fischer, 1966 and Bronstein vs Geller, 1961 would suggest that this line is also not without danger
for Black. <8. e4 Ne7 9. f4!?> White varies from 9. Bd3 which was
successfully used in the only other attempt by Black in this line in Yurtaev vs R Dautov, 1989 . <9...c5 10. Nf3> If 10. dxc5?!, then 10...Qa5!= leads to quick equality or better for Black. <10... Qa5 11. Bd2
Nbc6 12. d5> A worthy alternative here might be 12. Bd3! , going for quick development. <12... exd5 13. c4!> This little discovered attack move gives White a solid positional advantage. <13...Qd8 14. cxd5 Nd4 15. Nxd4 cxd4 16. Bc4 b5?> Relatively better was 16...Re8 17. 0-0 conceding White a smaller advantage, but retaining better drawing chances.

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